Aerator for liquids

Abstract: The aerator (1) has a body (4) having openings (5) formed therein and containing meshes (6) and a perforated plate (7). A monolithic convex diaphragm (8), defining a wall (8a), has holes (8b,8c) formed in a central region thereof and a perimetric (8d) ultrasonically welded to a seat formed in the plate (7). The convexity of the diaphragm (8) is oriented in a fluid flow direction, whereby retained particles are collected at the base of the perimeter of the diaphragm (8).

Description: The present invention relates to an improved aerator for liquids. It is known that so-called aerators are widely used, which are installed at the outlet of liquid conveyance ducts and particularly of ducts conveying water to sinks, with the specific purpose of breaking the stream of fluid into parallel threads so as to make the jet that exits into the atmosphere perfectly cylindrical. Known aerators include, according to a very common embodiment, a body usually installed in a ring associatable with the end of the duct that conveys the liquid and suitable to contain various elements, such as a pack of metal meshes and a perforated plate. A filter is furthermore installed at the end of the body on the liquid inlet side. The filter has the purpose of retaining the impurities present in the liquid, and has the shape of a mesh that covers the entire cross-section of said body. In order to limit the flow-rate of the liquid conveyed by the duct at the end of which the aerator is installed, so as to save on the consumption of said liquid, in the known art it is possible to place on said filter a cap which is kept in position by means of an appropriate gasket and has a solid wall with a central hole, so that the passage section of the liquid is reduced and the intended purpose is thereby achieved. The resulting complicated configuration, however, is clearly disadvantageous in terms of costs and from a functional point of view, since reassembly problems can occur every time the user disassembles the ring containing the aerator to clean the aerator itself. There are also aerators which have, at the end of the body containing the pack of meshes, a disk provided with a central hole for limiting the flow-rate, with the exclusion of any filtering action. However, impurities entrained by the liquid become trapped below said disk and cannot be removed in any way, causing rapid loss of efficiency of the device. Examples of aerators as mentioned above are available in the prior document EG-A-625 084. A further type of aerator, is known from US-A-4 657 186. A still further type of aerator is known from the prior document US-A-2 633 343 which discloses a fluid mixing device for producing a stream of liquid containing air bubbles and which has an upstream disc functioning to prevent dirt from clogging the downstream disc and also to assure a more even distribution of liquid to the downstream disc. An aim of the present invention is therefore to provide an improved aerator for liquids which has an extremely simple structure and allows to filter the liquid effectively before it enters the aerator itself and at the same time to limit the flow-rate of the conveyed liquid. With this aim in view, the invention provides an improved aerator for liquids, having the features comprised in claim 1. Further characteristics and advantages of the present invention will become apparent from the following description thereof, illustrated only by way of non-limitative example in the accompanying drawings, wherein: figure 1 is a perspective view of the diaphragm according to the invention; figure 2 is a sectional view, taken along a diametrical plane, of an aerator according to the invention inserted in a containment ring. With reference to the above figures, the reference numeral 1 generally designates the aerator, which is installed within a ring 2 adapted to be screwed at the thread 3 to the end of a liquid conveyance duct, such as, very commonly, the duct conveying water to a sink, and the reference numeral 3a designates a sealing gasket. Said aerator comprises a body 4, which has openings 5 and is suitable to contain meshes 6 and a perforated plate 7. All this occurs in a known manner. At the end of the body 4, on the side of the water inlet, there is a diaphragm 8, comprising a solid wall Ba which is convex toward the flow of fluid and has holes 8b, 8c for the passage of water exclusively in the central region and thus at the top of its convexity. Advantageously, the diaphragm 8 is made of plastics, like the body 4 and the plate 7, and has a monolithic structure provided with a perimetric edge 8d that mates with a seat formed at the end of the body 4 and more specifically in the plate 7, so that the entire assembly can be rigidly coupled by ultrasonic welding. The particular shape of the described diaphragm, which is placed at the end where the water enters the aerator body, gives said diaphragm considerable functionality. First of all it has the purpose of retaining the impurities present in the liquid, preventing them from entering the body of the aerator: all the retained particles slide to the base of the convex wall and collect at its perimeter, thus allowing immediate cleaning once access to the body 4 has been allowed by simply unscrewing the ring 2 from the end of the liquid conveyance duct However, the functionality of the diaphragm according to the invention is not limited to this: in fact, by virtue of the reduction in the liquid passage section caused by the presence of the solid wall region Ba that has no holes, it is capable of limiting the flow-rate of liquid conveyed by the duct at the end of which it is installed, thus providing a positive effect of saving in operation. To summarize, the diaphragm according to the invention combines the dual function of filter and flow limiter. In the practical embodiment of the invention, all the liquid passage holes, which may be present in any number and have any shape, may be arranged exclusively at a median band or at sectors, instead of being located in the central region; furthermore, the wall of the diaphragm, instead of being convex toward the flow of the fluid, may be substantially fiat. Where technical features mentioned in any claim are followed by reference signs, those reference signs have been included for the sole purpose of increasing the intelligibility of the claims and accordingly such reference signs do not have any limiting effect on the scope of each element identified by way of example by such reference signs.

Claims: Aerator for liquids, comprising a containment body (4), and located superimposed inside said body, from the water outlet towards the water inlet end thereof, meshes (6), a perforated plate (7), and a diaphragm (8) arranged at the end of the said body on the liquid inlet side and having at least a filtering function, characterized in that said diaphragm (8) is formed so as to have a solid wall (8a) only partially provided with liquid passage holes (8b, 8c) arranged exclusively and grouped in a selected region which is either a central region, at a median band or at sectors, so that said diaphragm. (8) performs a dual function, comprising both the filtering and and a limiting fluid flow function. Device according to claim 1, characterized in that the wall (8a) of the diaphragm (8) is convex toward the flow of liquid. Device according to one or more of the preceding claims, characterized in that the diaphragm (8) is made of plastics and has a monolithic structure including the convex wall (8a) provided with holes (8b, 8c) in the top region, delimited by a perimetric edge (8d) for connection to a seat formed at the end of said body (4). Device according to claim 1 or 3, characterized in that said body (4), said plate (7) and said diaphragm (8) are made of plastics. Device according to claims 1, 2 or 4, characterized in that said diaphragm (8), said perforated plate (7) and said body (4) can be coupled together by welding to lorm an assembly.

Inventors: BOSIO ORLANDO, BOSIO, ORLANDO
Applicants: AMFAG SPA, AMFAG S.P.A.
Application year: 1994
Main classification: E03C1
IPC codes: E03C1